Grids: Implement TabAdvance, so Tab key can behave independant of Enter key.
Remove goTabIgnoreAutoAdvance option, since it is not needed anymore.


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40067 4005530d-fff6-0310-9dd1-cebe43e6787f
Grids: rename goIgnoreRowContentForAutoAddRows option to goAutoAddRowsSkipContentCheck
(as discussed on lazarus-devel mailingist).


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40068 4005530d-fff6-0310-9dd1-cebe43e6787f